The effectiveness of customized dual-layer shade guides in the aesthetic resin restorations of anterior tooth
Objective:To discuss the effectiveness of customized dual-layer shade guides in the aesthetic resin resto-ration of Class Ⅲ and Ⅳ anterior tooth defects.Methods:A retrospective collection of 124 cases with anterior tooth Class Ⅲor Ⅳ defects was reviewed.Among these,22 cases were completed with the assistance of VITA shade guides,44 cases with single-layer resin shade guides,and 58 cases with customized dual-layer shade guides.Based on the four weeks'follow-up da-ta,the restorations were evaluated using the modified USPHS criteria for integrity,color match,marginal discoloration,and gingival health.A statistical analysis was then performed.Results:The occurrences of failure in the VITA shade group,single-layer resin shade group,and dual-layer resin shade group were 2 cases,2 cases,and 1 case,respectively,all of which exhibi-ted severe color mismatch.The success rates of restoration in the three groups were 90.9％,95.5％,and 98.3％,respective-ly,with an overall restoration success rate of 96.0％.Conclusion:No significant clinical differences were observed among the use of VITA shade guides,single-layer resin shade guides,and dual-layer resin shade guides.
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